SparkR (version 2.4.6)

colnames: Column Names of SparkDataFrame

Description

Return a vector of column names.

Usage

colnames(x, do.NULL = TRUE, prefix = "col")
colnames(x) <- value
columns(x)
# S4 method for SparkDataFrame
columns(x)
# S4 method for SparkDataFrame
names(x)
# S4 method for SparkDataFrame
names(x) <- value
# S4 method for SparkDataFrame
colnames(x)
# S4 method for SparkDataFrame
colnames(x) <- value

Arguments

x

a SparkDataFrame.

do.NULL

currently not used.

prefix

currently not used.

value

a character vector. Must have the same length as the number of columns to be renamed.

See Also

Other SparkDataFrame functions: SparkDataFrame-class, agg(), alias(), arrange(), as.data.frame(), attach,SparkDataFrame-method, broadcast(), cache(), checkpoint(), coalesce(), collect(), coltypes(), createOrReplaceTempView(), crossJoin(), cube(), dapplyCollect(), dapply(), describe(), dim(), distinct(), dropDuplicates(), dropna(), drop(), dtypes(), exceptAll(), except(), explain(), filter(), first(), gapplyCollect(), gapply(), getNumPartitions(), group_by(), head(), hint(), histogram(), insertInto(), intersectAll(), intersect(), isLocal(), isStreaming(), join(), limit(), localCheckpoint(), merge(), mutate(), ncol(), nrow(), persist(), printSchema(), randomSplit(), rbind(), rename(), repartitionByRange(), repartition(), rollup(), sample(), saveAsTable(), schema(), selectExpr(), select(), showDF(), show(), storageLevel(), str(), subset(), summary(), take(), toJSON(), unionByName(), union(), unpersist(), withColumn(), withWatermark(), with(), write.df(), write.jdbc(), write.json(), write.orc(), write.parquet(), write.stream(), write.text()

Examples

# NOT RUN {
sparkR.session()
path <- "path/to/file.json"
df <- read.json(path)
columns(df)
colnames(df)
# }